PDF API won't open Acrobat X or above protected files.

I'm developing a Windows 8.1 App that uses the Windows.Data.PDF API.
My PDF files were created with Adobe Acrobat XI and are password protected.
On implementing PdfDocument.LoadFromFileAsync I receive an unspecified error.
After some diagnosis, I found that if the PDF is saved in an earlier Adobe Acrobat format than version X, the program works fine.
Could it be something to do with AES 256 Encryption that the later acrobat versions use?
Is this a bug in the PDF API?
If so, where do I report it?

Hi,
>>On implementing PdfDocument.LoadFromFileAsync I receive an unspecified error.
>>After some diagnosis, I found that if the PDF is saved in an earlier Adobe Acrobat format than version X, the program works fine
Yes, based on the official PDF viewer sample:
https://code.msdn.microsoft.com/PDF-viewer-sample-85a4bb30
I could reproduce your issue using
PdfDocument.LoadFromFileAsync(IStorageFile, String) method to load a password-protected(256-bit AES) PDF document, and this worked well for a 128-bit AES encryption Level PDF document.
Currently, looks like this API don't support this encryption Level.
>>If so, where do I report it?
For this issue, I'm trying to consult with some experts, thank you for your feedback:)
You could also submit your feedback at this site:
https://wpdev.uservoice.com/forums/110705-dev-platform
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
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